Expansion joint



I Dec. 29, 1936. A. c. FISCHER EXPANSION JOINT Filed Nov. 30, 1931 Patented Dec. 29, 1936 UNITED STATES PATENT OFFICE EXPANSION JOINT Albert C. Fischer, Chicago, Ill.

Application November 30, 1931, Serial No. 577,961

Claims.

For a better understanding of the invention reference may be made to the accompanying drawing, in which:

Fig. 1 is a perspective view of a composition sheet embodying the invention;

Fig. 2 is a perspective view of a modified form of construction; "and Fig. 3 is a paving section in which the sheet is adapted to beinserted.

.The novel and improved composition sheet is adapted for various uses, particularly for thermal and sound insulation, cushioning layers for floors, pavements, walls and the like, and for spacing rigid elements to allow for contraction and expansion under varying temperatures.

The invention, for the purpose of illustration, is typified by construction sheets, such as expansion joints, which are inserted longitudinally or transversely at intervals in paving construction to divide-the pavement into blocks or sections. Referring specifically to the drawing, numeral 2 designates the sheet generally comprising a composite structure composed of core strips 3 and 4 and surfacing layers 5. Strips 3 may be composed of such material as asphalt or the like, spaced apart with an intervening recess which may, if desired, be filled with elastic material 4, such as sponge rubber or the like. The surfacing sheets may be bituminized felt, paper, or thelike- The modified structure in Fig. 2 is substantially the same as that shown in Fig. l and described above, It discloses the further feature of dividing the elastic strip into sections 6, and spacing them apart longitudinally to provide recesses I.

Heretofore, the core of the sheets has been composed of asphalt interposed to fill the entire space between the surfacing sheet. Accordingly, when the sheets were usedas expansion joints in paving constructions between paving sections A or where they were subjected to compressing forces, there was a tendency for the asphaltic core to be squeezed out and beyond the margins of the surfacing sheets, where pieces of it would break off and be displaced by passing vehicles. This would,

of course, leave unfilled spaces along the exposed edge with which water would collect and seep into the substructure of the pavement.

The aim of the present invention is to provide a structure whereby the asphalt strips may yield within the body of the sheet proper, and not be -squeezed therefrom. This is accomplished by the novel and improved structures above described, wherein the core comprises two or more narrow asphalt strips spaced apart to provide intervening unfilled spaces or spaces filled with elastic material.

While I have shown two preferred embodiments typifying my invention and described them in detail, it'will be understood that the invention is not limited thereby. Various changes may be made in details of construction without departing from the spirit of the invention.

I claim:

1. A composition sheet comprising a core composed of asphalt strips spaced apart to provide an intervening space between the strips, elastic material inserted within the space, and surfacing sheets applied to face the core.

2. A composition sheet comprising a core composed of asphalt strips spaced apart to provide an intervening space between the strips, a sponge rubber strip inserted within the space, and surfacing sheets applied to face the core.

3. A composition sheet comprising a core composed of asphalt strips spaced apart to provide an intervening space between the strips, an elastic strip inserted within the intervening space, and surfacing sheets of bituminized fibrous material applied to face the core.

4. A composition sheet comprising a core composed of asphalt strips spaced apart to provide an intervening space between the strips, an elastic strip inserted within the intervening space and divided longitudinally into sections, and surfacing sheets applied to face the core.

5. A composition sheet comprising a core composed of asphaligstrips spaced apart to provide sections spaced apart with interposed composition sheets, said sheets comprising a core composed of asphalt strips spaced apart to provide an intervening space, elastic material inserted within the space, and surfacing sheets of bituminized fabric applied to the face of the core.

8. An expansion joint including a pair of spaced paving slabs, a top layer of asphaltlc material between said slabs at their top, an intermediate layer of sponge rubber below and in contact with said top layer, and a lower layer of asphaltic material below and in contact with said intermediate layer.

9. An expansion joint including a pair of spaced paving slabs, a top layer 01' asphaltic material between said slabs at their top, an intermediate layer of sponge rubber below and in contact with said top layer, and a lower layer of asphaltic material below and in contact with said intermediate layer, said layers all being secured together independently of said paving slabs.

10. An expansion joint including a pair of spaced paving slabs, a top layer of plastic material between said slabs at their top, an intermediate layer of sponge rubber below and in contact with said top layer, and a lower layer of plastic material below and in contact with said intermediate layer.

ALBERT C. FISCHER. 

